Relationship between “clearness index” and “cloudiness index” at a tropical station (Ilorin, Nigeria)

Babatunde, E. B.; Aro, T O

doi:10.1016/0960-1481(94)00087-m

Cited by 11 publications

(6 citation statements)

References 2 publications

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“…light intensity), among other factors, is influenced by the sky conditions and the period of the year. The cloudiness index, which is given by the ratio of the amount of diffuse to total solar radiation incident on the ground surface, 13,14 was used to assess the sky condition. In Figure 6 is shown the influence of sky conditions (i.e.…”

Section: Resultsmentioning

confidence: 99%

Dynamic control of supplemental lighting intensity in a greenhouse environment

Pinho

Hytönen

Rantanen

et al. 2012

Lighting Research & Technology

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The global increase in energy prices, the urgent need to reduce CO 2 emissions to the atmosphere and the high energy usage are currently the major threats to the greenhouse industry. Optimised control of the lighting quality, quantity and periodicity can contribute to improvements in the productivity and energy efficiency of greenhouses. In this paper, the effects of dynamic control of supplemental lighting intensity on electricity consumption and fresh weight accumulation of lettuce plants are investigated. The use of the dynamic lighting control resulted in a 20% reduction in the electricity consumption in comparison to a similar lighting system operated under a discontinuous on-off regime. However, there was no statistically significant difference between both regimes in terms of plants' average fresh weight accumulated per electrical energy unit consumed.

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Section: Resultsmentioning

confidence: 99%

Dynamic control of supplemental lighting intensity in a greenhouse environment

Pinho

Hytönen

Rantanen

et al. 2012

Lighting Research & Technology

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“…El Sol es una esfera de materia gaseosa intensamente caliente cuyo diámetro mide 1,39 x 10 9 m; está a una distancia promedio de 1,5 x 10 11 m de la Tierra y tiene una temperatura efectiva de 5.777 K (Montero-Martín et al, 2020, Santos et al, 2018. El índice de claridad es un parámetro de radiación adecuado para describir diferentes condiciones atmosféricas relacionadas con la transferencia de radiación en la atmósfera (Babatunde & Aro, 1995). La radiación solar es la principal fuente de energía para la tierra.…”

Section: Introductionunclassified

Análisis del índice de claridad atmosférica diaria en la ciudad de Puno, 2014-2021

Quispe Huaman

2024

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

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El índice de claridad atmosférica es un parámetro óptico que resulta de la relación de la radiación solar global y la extraterrestre; dicha relación indica el estado atmosférico de una zona, las condiciones y características climáticas y su cambio en el transcurso del tiempo. El objetivo del presente estudio fue analizar el índice de claridad atmosférica en Puno desde enero del 2014 hasta diciembre del 2021, exceptuando el 2016 por ausencia de datos registrados. La radiación solar global se midió con el piranómetro Kipp & Zonen CMP11 del Servicio Nacional de Meteorología e Hidrología - Zonal Puno en diferentes condiciones de cielo: muy soleado, soleado, parcialmente nublado y nublado. Según los resultados, el 39,138 % de los días fueron muy soleados, el 25,636 % soleados, el 34,873 % parcialmente nublados y el 0,313 % nublados, con variaciones en el índice de claridad atmosférica de 0,755-, 990, 0,645-0,754, 0,263-0,644 y 0-0,242, respectivamente, y un promedio de radiación solar global de 6,624 kWh/m2. En conclusión, este índice de claridad atmosférica es óptimo para la observación astronómica, la aviación y la implementación de los sistemas fotovoltaicos orientados a mitigar la contaminación antropogénica en el medio ambiente de la ciudad y la región de Puno.

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“…1379-1387 rather the order number of the month during the year. Babatunde and Aro [4] have found the relationship between clearness and cloudiness index at Illorin, Nigeria and concluded that the two ratios are linearly related. A new correlation has been developed between clearness index and relative sunshine for the evaluation of monthly mean daily global radiation by Coppolino [5] at Italian locations.…”

Section: Introductionmentioning

confidence: 99%

Analysis of ratio of global to extra-terrestrial radiation (clearness index) at some tropical locations in India

Ravichandran¹,

Rathnaraj²

2017

THERM SCI

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An attempt has been made to analyze and evaluate the daily average clearness index (H g /H 0 ) in terms of daily average cloudiness index (H d /H 0 ) for three tropical locations in South India (Chennai, Trivandrum, and Visakapatnam). Long term data (15 years, 1993-2007) of measured daily average global and diffuse solar radiation for the locations have been used for this study. Two correlation equations (linear and polynomial) for each location have been developed for clearness index in terms of cloudiness index and found its validity. Performance statistics of the model has been done and applicability of the model is done by comparing the performance statistics with the existing models. It has been found that the proposed model has least error compared with the existing models.

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Relationship between “clearness index” and “cloudiness index” at a tropical station (Ilorin, Nigeria)

Cited by 11 publications

References 2 publications

Dynamic control of supplemental lighting intensity in a greenhouse environment

Dynamic control of supplemental lighting intensity in a greenhouse environment

Análisis del índice de claridad atmosférica diaria en la ciudad de Puno, 2014-2021

Analysis of ratio of global to extra-terrestrial radiation (clearness index) at some tropical locations in India

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